Improvement in locomotive and other boilers



A. 0. DENN).y

Locomotive andl Other Boilers. l N0.`l48,426 Patented March10.1874.

UNITED STATES PATENT OFFICE..

ASA O. DENIO, OF WILMINGTON, DELAWARE, ASSIGNOR TO HIMSELF., EDWARD RUSHTON, ANI) STILLMAN A. HODGMAN, OF SAME PLAGE.

IMPROVEMENT IN LOCOMOTIVE AND OTHER BOILERS.

Specication forming part of Letters Patent No. 148,426, dated March 10, 1874; application filed January 7, 1874.

haust of the engines, and this object I attainby means of a series of vanes placed in the smoke-box between the exhaust-pipe and the tube-sheet of the boiler, as shown in the longitudinal section, Figure 1, the sectional plan,

Fig. 2, and the transverse vertical section, Fig. 3, of the accompanying drawing.

A represents part of the shell of a locomotive-boiler5 B, the rear tube-plate, and E, the smoke box, within which are secured two frames, D D, and to each frame are pivoted a series of vertical vanes, a, the vanes of one frame being connected together by a crossbar, G, and those of the other frame byla crossbar, G. One of these bars is connected to one arm, and the other to the other arm, of a lever, H, which is hung to a pin connected to the frames. A third arm of the lever is connected by a rod, I, to au attachment, J, by which two horizontal vanes, a', are connected together, the latter frames being pivoted to continuations c c of the two frames D D. A rod, K, extends from the upper arm of the lever H to an arm, M, on a vertical shaft, m, adapted to a bearing, N, attached to, and extending through, the shell of the boiler, on the outsidc'of which the shaft has an arm, n, a rod connected to which extends to the opposite end of the boiler, so as to be within reach of the engineer, who is thus enabled to partially open, or entirely close, the vanes. The products of combustion from the tubes are prevented from passing below the frames D by a plate, q, which connects the lower edges of the said frames with the shell of the boiler.

Although the vanes c and a are shown in the drawing, and have been describedabove as being movable, and although I prefer to so arrange the vanes that they will be under the immediate control of the attendant engineer, the objects of my invention may be partially .attained by stationary vanes, providing they be arranged at about the angle shown in the drawing, for such stationary vanes would serve the purpose of directing the products of coinbustion to a central point in the smoke-box7 where they will be brought under the direct influence of the exhaust steam, and the stationary vanes would serve the additional purpose of retaining the heat in thetubes, and of so neutralizing the violent action of the exhaust as to prevent the usual masses of fuel from being drawn from the fire-box and through the tubes. I prefer, however, to make the vanes movable, so as to be y'readily controlled by the engineer, who, in some cases, may nd it advisable to entirely close the vanes, thus preventing the products of combustion from escaping into the smoke-box, exceptin g through the slight vent presented by the opening between the two frames, which will insure sufiicient draft to induce the fuel to burn slowly. In other cases the vanes may be opened to a very limited extent, and others to the extent illustrated in the drawing, but it will rarely be necessary to open the vanes to a greater extent than is there shown.

It will be seen that the engineer, by means of these vanes and their connections, has complete control of the draft, which is regulated at a point between the tube-sheet and exhaust-nozzles, so that there can be no necessity for restrictingthe free exhaust of the steam under any circumstances.

My invention, it will be evident, is applicable to vertical and other tubular boilers, as well as to locomotives.

I claim as my inventionl. The vanes a and c', arranged in the inanner described, so as to direct the products of combustion to a central point in the smokebox.

their vanes c a, cross-bars G G', the vanes a', and lever H, and mechanism, substantially as described, for operating the vanes simultaneously through the said lever.

In testimony whereof I have signed my naine to this speciiication 1n the presence of two sub scribing witnesses.

AsA AoBEn DENio.

Witnesses H. S. TRUITT, JNO. HENRY PUHL.

2. The combination of the frames D D ami 

